56156101611565 has 4 divisors (see below), whose sum is σ = 67387321933884. Its totient is φ = 44924881289248.

The previous prime is 56156101611551. The next prime is 56156101611607. The reversal of 56156101611565 is 56511610165165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11992181998729 + 44163919612836 = 3462973^2 + 6645594^2 .

It is a cyclic number.

It is not a de Polignac number, because 56156101611565 - 2²¹ = 56156099514413 is a prime.

It is a super-4 number, since 4×56156101611565⁴ (a number of 56 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5615610161152 + ... + 5615610161161.

It is an arithmetic number, because the mean of its divisors is an integer number (16846830483471).

Almost surely, 2^{56156101611565} is an apocalyptic number.

It is an amenable number.

56156101611565 is a deficient number, since it is larger than the sum of its proper divisors (11231220322319).

56156101611565 is a wasteful number, since it uses less digits than its factorization.

56156101611565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11231220322318.

The product of its (nonzero) digits is 810000, while the sum is 49.

The spelling of 56156101611565 in words is "fifty-six trillion, one hundred fifty-six billion, one hundred one million, six hundred eleven thousand, five hundred sixty-five".